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You can read this book on your own. There are plenty of examples. The exercises illustrate the ideas you're supposed to master. With some effort you can get a lot out of this text. But if you read this book just by yourself, you'll miss the discussion and exchanges in class that make the ideas come alive. Many of the exercises are designed for discussion.
That's where your understanding will crystallize, and you'll find that you can begin to use the ideas and methods of critical thinking. You'll get the most out of discussions if you've worked through the material first. Read the chapter through once, with a pencil in hand. Get an overview. Mark the passages that are unclear. You need to understand what is said—not all the deep implications of the ideas, not all the subtleties, but the basic definitions. You should have a dictionary on your desk.